Add a release-time safety check for silently corrupted versioned install scripts

[jnasbyupgrade]

sql.mk regenerates the current version's sql/cat_tools--.sql.in from sql/cat_tools.sql.in whenever default_version and that source file change, via the $(EXTENSION_VERSION_FILES:.sql=.sql.in) rule (cp $< $@). If default_version is ever left pointing at an already-tagged real version rather than the stable pseudo-version, a later source edit silently overwrites — and corrupts — that released version's committed install file. Add a new step 1 to RELEASE.md, before the version-bump steps, that has the release manager compare each committed versioned install script's last-touching commit against the git tag for that version, flagging any file touched after its own release as a red flag worth investigating, while noting that a late touch-date can also be a legitimate backfill rather than corruption. Renumber the remaining steps (2-7) and their cross-references accordingly.

Checked cat_tools' own history while writing this: default_version has in fact never been the literal string stable in cat_tools.control's git history (it's a real version right now, 0.3.0) — the stable pseudo-version scheme described elsewhere in this doc is still aspirational, not yet implemented. That's out of scope here; this PR is only the safety-check checklist addition. Also checked both currently-tagged versions (0.2.2, 0.2.3) against this new check: both are clean, no drift found.

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